DVD reader/writer shows blank DVD/CD

Hi !
I have HP Pavilion w1164d Desktop PC , I formatted my system and now whenever I insert my dvd or any cd it shows blank dvd/cd. I tried a video cd it shows the icons but when I play it it does'nt pay and shows some error.

Conclusion - After formatting my system , my Cd/Dvd reader cum writer is showing the Cd blank, I have tried many dvd's but it shows that my DVD is blank